109 prop pitch (rpm) and the supercharger

[kohmelo]

Originally Posted by Crumpp

Exactly....

As the speed increases, they will have to coarsen pitch to maintain rpm.

So like with car going up hill with 5th gear you can not sustain you speed it is declining down and you change to 4th gear you could use that gear to sustain efficient speed or you can accerate but you can not sustain the accelerated speed because of the strain to the engine and cooling. So you change back to 5th gear where your speed starts to decline but the straing is not as big at the point where drag and inertia start to slow you enormously (as with propeller driving engine) you change back to 4th gear. (manual or auto transmission technically the same --> except auto forces to change to bigger gear)

--> Same with automatic variable transmission would be like with autoprop in bf109 you are pushing at the theorethical best efficient gear ratio for your throttle setting but with variable transmission you cannot get that small boost when you need it of rpm.